Gotcha! Snooki, Mike Tyson, Joan Rivers, and even the White House got into the spirit of April Fools' Day on Monday, with a few headline-making tweets that may have just been hoaxes.

Snooki, who has previously stated that she won't be tying the knot with her fiancé, Jionni LaValle, anytime soon, tweeted a shot of herself in an elaborate lace gown getup (complete with diamond-encrusted tiara) on Monday afternoon, with the caption, "Jionni and I eloped! Here's a pic of the magical day!"

"Ok. April Fools. There is no #GoodbyeMikeTysonTattoo," he reassured fans. "This tattoo is with me forever."

Some celebrity tweets weren't quite so clear about their joke-y nature, however. Teen Mom star Farrah Abraham, 21, who was arrested for a DUI in March and who has previously been in the news for waxing her 3-year-old daughter's eyebrows, posted the big news that she's looking to expand her family -- by adopting.

"Big day for Sophia & I," she shared on the social media site on Monday morning. "Were adopting a baby brother, Sophie is super excited xo! Adopting is a #blessing."

Though a few fans responded to Abraham's tweet with a hearty congratulations, most were quick to shoot the tweet down as an April Fools' Day joke.

"Clearly this will be a pet or an April fools joke," one follower commented.

Comedienne Rivers, who's always game for a laugh, got in on Twitter's April Fools' Day joke one day early, sharing her take on Twitter's fake "two-tiered service" -- a system that involves a removal of all vowels.

"We're doing this because we believe that by eliminating vowels, we'll encourage a more efficient and 'dense' form of communication," the company announced on its blog. "We also see an opportunity to diversify our revenue stream."